Overview
The TPS51120RHBT is a highly sophisticated dual, synchronous step-down controller produced by Texas Instruments. This controller is designed to run directly off a three- or four-cell Li-ion battery, providing high-power and 5-V and/or 3.3-V standby regulation for downstream circuitry in systems such as notebook computers. It features high-current, 100-mA, 5-V or 3.3-V on-board linear regulators with glitch-free switch over to SMPS, which can be kept alive independently during standby state.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 32-pin QFN (RHB) |
| Operating Temperature Range | -40°C to 85°C |
| Supply Input Voltage Range | 4.5 V to 28 V |
| Internal Reference Accuracy | Less than 1% |
| Bootstrapped Standby Regulators | 3.3-V and 5-V, 100-mA |
| Current Sensing | Low-side RDS(on) Loss-less Current Sensing, RSENSE Accurate Current Sense Option |
| Power Good Signals | Power-good for Each Channel with Delay Timer |
Key Features
- 3.3-V and 5-V 100-mA Bootstrapped Standby Regulators with Independent Enables
- Selectable D-CAP™ Mode Enables Fast Transient Response Less than 100 ns
- Selectable Low Ripple Current Mode
- Selectable PWM-only/Auto-skip Modes
- Internal Soft-Start and Integrated VOUT Discharge Transistors
- Integrated 2-V Reference
- Adaptive Gate Drivers with Integrated Boost Diode
- Fault Disable Mode
Applications
The TPS51120 is primarily designed for use in notebook computer systems, providing high-power and standby regulation. It is also suitable for other applications requiring dual synchronous step-down conversion, such as:
- Notebook computers
- High-power electronic devices
- Systems requiring multiple voltage rails
Q & A
- What is the primary function of the TPS51120?
The TPS51120 is a dual, synchronous step-down controller designed to provide high-power and standby voltage regulation.
- What is the input voltage range for the TPS51120?
The input voltage range is from 4.5 V to 28 V.
- What are the standby regulators available on the TPS51120?
The TPS51120 features 3.3-V and 5-V, 100-mA bootstrapped standby regulators.
- Does the TPS51120 support different control modes?
Yes, it supports both true current mode control and D-CAP mode control.
- What is the significance of the D-CAP mode in the TPS51120?
The D-CAP mode enables fast transient response less than 100 ns and is optimized for SP-CAP or POSCAP output capacitors.
- How does the TPS51120 handle current sensing?
The TPS51120 features low-side RDS(on) loss-less current sensing and RSENSE accurate current sense option.
- Does the TPS51120 have integrated power good signals?
Yes, it has power-good signals for each channel with a delay timer.
- What is the operating temperature range of the TPS51120?
The operating temperature range is from -40°C to 85°C.
- What package type is the TPS51120 available in?
The TPS51120 is available in a 32-pin QFN (RHB) package.
- Does the TPS51120 support fault protection?
Yes, it includes a fault disable mode and other protection features like UVLO, UVP, and OCP.
